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Measurements of pulsar acceleration reveal Milky Way's dark side 5nvklj





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Measurements of pulsar acceleration reveal Milky Way's dark side

Dragon
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Measurements of pulsar acceleration reveal Milky Way's dark side Empty Measurements of pulsar acceleration reveal Milky Way's dark side

Post by Dragon Wed Jan 13, 2021 4:02 am

It is well known that the expansion of the universe is accelerating due to a mysterious dark energy. Within galaxies, stars also experience an acceleration, though this is due to some combination of dark matter and the stellar density.

In a new study to be published in Astrophysical Journal Letters researchers have now obtained the first direct measurement of the average acceleration taking place within our home galaxy, the Milky Way.

Led by Sukanya Chakrabarti at the Institute for Advanced Study with collaborators from Rochester Institute of Technology, University of Rochester, and University of Wisconsin-Milwaukee, the team used pulsar data to clock the radial and vertical accelerations of stars within and outside of the galactic plane.

Based on these new high-precision measurements and the known amount of visible matter in the galaxy, researchers were then able to calculate the Milky Way's dark matter density without making the usual assumption that the galaxy is in a steady-state.

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Dragon
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Measurements of pulsar acceleration reveal Milky Way's dark side Empty Re: Measurements of pulsar acceleration reveal Milky Way's dark side

Post by Dragon Wed Jan 13, 2021 4:03 am

Measurements of pulsar acceleration reveal Milky Way's dark side Measurements
Credit: IAS; Dana Berry

The ripples in the Milky Way disk are shown, along with the tidal debris from the Sagittarius dwarf galaxy.

The pulsars analyzed by Chakrabarti et al 2021 to calculate Galactic accelerations are shown in the inset.

Source / Image Courtesy


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Measurements of pulsar acceleration reveal Milky Way's dark side 334pu7m

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Measurements of pulsar acceleration reveal Milky Way's dark side Empty Re: Measurements of pulsar acceleration reveal Milky Way's dark side

Post by Dragon Wed Jan 13, 2021 4:12 am



NASA’s NICER Reveals 1st-ever Pulsar Surface Map


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